Date: Sat, 20 Jan 2001 16:03:08 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: Mark Murray <mark@grondar.za>, current@FreeBSD.org, The Hermit Hacker <scrappy@hub.org> Subject: Re: current hangs... Message-ID: <XFMail.010120160308.jhb@FreeBSD.org> In-Reply-To: <6178.980033892@critter>
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On 20-Jan-01 Poul-Henning Kamp wrote: > In message <XFMail.010120145554.jhb@FreeBSD.org>, John Baldwin writes: >> >>On 20-Jan-01 The Hermit Hacker wrote: >>> On Sat, 20 Jan 2001, Mark Murray wrote: >>> >>>> > >>>> > on a 2xPII/350, 256M, two scsi disks on ahc, and ccd I have three times >>>> > now hung the machine so that only reset got any attention simply by >>>> > make -j 128 world >>>> >>>> Do you have an easy way to narrow it down to CCD by doing the same >>>> thing but without ccd involvement? >>> >>> I don't have CCD, and got home last night from the office and mine was >>> hung also, on a kernel from the day before ... being in X, pretty much >>> nothing I could do to try and debug it ... new laptop gets in this week, >>> so will be setting up the whole serial console debugging env ... >> >>Is it SMP, and does it have multiple SCSI disks hanging off of the same >>device? > > SMP, one scsi disk on each controller, /usr and /home ccd'ed. Is there any code dealing with disk I/O in the kernel that does the equivalent of this: while (!io_done) /* spin */ ; That assumes an interrupt will set io_done? Using DELAY() in places might explain this. If the kernel is spining, then it is probably holding Giant, which prevents Ctrl-Alt-Esc (keyboard ithread blocks on Giant) not to mention we aren't doing a task switch to it anyways. Also, NMI's would be blocked by trap() being broken. I have a patch for trap() btw that tells it to not bother with Giant for NMI's. I haven't tested it yet though. -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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